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D6571E

EASYTAD™ Chip for an All- Digital Telephone Answering Machine with Flash Memory Interface

Unspecified 

D6571E Data Sheet

(Test Mode = 0011) nor Initialization (Test Mode = 0001)

are available if they don’t follow Flash Hardware

Selection command.

4) Codec Hardware Selection (Test Mode = 0100)

This command configures the system for the various

codec interface operating modes available.

M/S - Configures the D6571E to operate in either Master

or Slave mode of the Codec Interface.

LAW - Configures the D6571E to operate with either an

µ-law Codec (default) or an A-law Codec.

CODEC Type Selection - allows selection of short

(default) or long frame sync for the CODEC interface.

When two CODECs are connected to the D6571E, the

HOST can select the input or the output CODEC for

each function. If CODEC0 is connected to the

telephone line and CODEC1 is connected to the

microphone and speaker, the HOST can select to record

or play through each one of the CODECs. CODEC

Selection enables the following options with a 2-CODEC

configuration.

INPUT CODEC - allows selecting the input data streams

from CODEC0 and CODEC1.

Bit 2

0

1

CODEC INPUT

Input through CODEC0

(default)

Input through CODEC1

OUTPUT CODEC - allows selecting the CODEC output

between CODEC0 or CODEC1 (or both).

Bit 4

0

0

1

Bit 3

0

1

0

CODEC OUTPUT

CODEC

(Default mode.) Output data stream in

the Record, Playback, Tone

Generation, Line Monitor, Voice

Prompt modes is directed to CODEC0

(via pin TX0). In the SpeakerPhone

mode signal to the telephone line is

directed to CODEC0, signal to the

speaker to CODEC1 (via pin TX1).

This mode should be used for

SpeakerPhone operation.

Output data is directed in all modes only

to CODEC1 (via pin TX1).

Output data is directed in all modes only

to CODEC0 (via pin TX0).

1

1

Data is directed in all modes to both

CODECs.

A RESET signal will set all codec configurations to the

default values.

Codec Selection command has the same performance in

case of “cold” and “warm” start.

5) Codec Loopback (Test Mode = 0110)

Activates Codec loopback. This mode is available in

case of “cold start.”

6) Algorithm Configuration (Test Mode = 0111)

Submode 000 = DTMF Configuration

This command configures DTMF detector (sub mode 0)

to report detection of 12 digits (0-9, *, #) or 16 digits (0-9,

*, #, A, B, C, D). By default the D6571E is in 12 digit

mode.

Submode 001 = CAS Configuration

Allows to change threshold levels of the CAS detector

Submode 010 = AGC Configuration

This command activates AGC. AGC, when activated, is

functional in the Record mode. Main parameters of the

AGC are programmable and can be defined by the AGC

Configuration command. By default AGC is disabled.

Programmable AGC Parameters

The following Parameters can be programmed by Host

using AGC Configuration command.

Optimum Level Eopt - desired output level after AGC

operation. For input signals of Eopt level the AGC will

set gain = 1. Input signals greater that Eopt will be

attenuated. Input signals smaller than Eopt will be

amplified.

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

20

SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490

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